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//=================================================================
//
//        snprintf.c
//
//        Testcase for C library snprintf() implementation
//
//=================================================================
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//=================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):       Uwe Kindler
// Contributors:
// Date:            2009-08-05
// Description:     Contains testcode for C library snprintf() function
//
//
//####DESCRIPTIONEND####
 
// CONFIGURATION
 
#include <pkgconf/libc_stdio.h>   // Configuration header
 
// INCLUDES
 
#include <stdio.h>
#include <cyg/infra/testcase.h>
 
static int my_strnlen(const char *s, size_t maxlen)
{
    const char *ptr;
    const char *endptr;
 
    ptr = s;
    endptr = s + maxlen;
    while ((*ptr != '\0') && (ptr != endptr))
    {
        ptr++;
    }
 
    return (int)(ptr-s);
} // my_strlen()
 
static void
test( CYG_ADDRWORD data )
{
    static char x[32];
    static char y[4];
    int xret;
    int yret;
    int xstrlen;
    int ystrlen;
 
    // fill buffer to ensure that there are no zeros in the buffers
    memset(x, 0xFF, sizeof(x));
    memset(y, 0xFF, sizeof(y));
 
    // print into a buffer with sufficient size 
    xret = snprintf(x, sizeof(x), "%d:%d:%d:%d", 1, 2, 3, 4);
    xstrlen = my_strnlen(x, sizeof(x));
 
    // print into a buffer that is too small
    yret = snprintf(y, sizeof(y), "%d:%d:%d:%d", 1, 2, 3, 4);
    ystrlen = my_strnlen(y, sizeof(y));
 
    CYG_TEST_PASS_FAIL(xret == xstrlen, "[buffer > strlen] return code");
 
#ifdef CYGIMP_LIBC_STDIO_C99_SNPRINTF
    // C99 compliant implementation returns the number of characters that 
    // would have been written had size been sufficiently large, 
    // not counting the terminating nul character
    CYG_TEST_PASS_FAIL(xret == yret, "[buffer < strlen] return code");
    CYG_TEST_INFO("C99 compliant implementation of snprintf()");
#else
    // default eCos implementation returns number of bytes written into
    // the buffer without terminating nul character
    CYG_TEST_PASS_FAIL(yret == ystrlen, "[buffer < strlen] return code");
    CYG_TEST_INFO("Default implementation of snprintf() (no C99 compliance)");
#endif
 
 
    CYG_TEST_FINISH("Finished tests from testcase " __FILE__
                    " for C library snprintf() function return values");
 
} // test()
 
int
main(int argc, char *argv[])
{
    CYG_TEST_INIT();
 
    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C "
                  "library snprintf() function return values");
    CYG_TEST_INFO("These test return values of snprinf() family of functions");
 
    test(0);
 
    return 0;
} // main()
 
// EOF snprintf.c